Glossary
SC
System Controller
SD
Signal Degrade
SDH
Synchronous Digital Hierarchy. Definition of the degree of control of the various clocks
in a digital network over other clocks.
SDH-TE
SDH - Terminal Equipment
SDSL
Symmetric Digital Subscriber Line
SDSL-NT10ETH
A 1- to 4-port SHDSL modem with two 10BASE-T Ethernet interfaces towards the
end-user.
SDSL-NT2M
A 1-port SHDSL modem with a single 2 Mbit/s interface towards the end-user.
SEC
SDH Equipment Clock
Secondary ITM-SC
Backup ITM-SC for a network element should the primary ITM-SC fail. A network
element should be provisioned normally on the primary ITM-SC and then be configured
for use on the secondary ITM-SC. See also Geographic Redundancy.
Section
A transport entity in the transmission media layer that provides integrity of information
transfer across a section layer network connection by means of a termination function at
the section layer.
Section Adaptation (SA)
Function that processes the AU-pointer to indicate the phase of the VC-3/4 POH relative
to the STM-N SOH and assembles/disassembles the complete STM-N frame.
Section Overhead (SOH)
Capacity added to either an AU-4 or to an assembly of AU-3s to create an STM-1.
Always contains STM-1 framing and can contain maintenance and operational functions.
SOH can be subdivided into MSOH (multiplex section overhead) and RSOH (regenerator
section overhead).
SEF
Support Entity Function (in NE)
Self-healing
A network's ability to automatically recover from the failure of one or more of its
components.
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GL-28
Alcatel-Lucent - Proprietary
See notice on first page
365-312-803R7.2
Issue 4, May 2007